Comment 159 for bug 211631

After months of attempts to fix this, I've finally found one that works for Kubuntu 11.04 (Natty). The problem is that Kubuntu (and I believe KDE more generally) starts the shutdown process in a way different than Gnome/Ubuntu, so even the dbus / netbase fixes, the fix above in #158, and using autofs all didn't work. I think KDE begins shutting down userspace functions like network manager first before the /etc/init scripts or /home/user/.kde/shutdown scripts are called upon. Just speculation on my part, but that'd be my guess.

But I apparently found the place where Kubuntu actually starts the shutdown process, or close to it - it's in the /usr/bin/starkde script. Immediately after the line saying "echo 'startkde: Shutting down...' 1>&2", I inserted a line saying "sudo umount -t cifs -a -f -l". Then, using visudo as root ("sudo visudo"), I edited the sudoers file to allow the sudo command to execute umount without a password by adding the line (at the bottom of the file) "username ALL=(root) NOPASSWD:/bin/umount". Worked like a charm.